Improved apparatus for calcining ores



G. W. WHITE. APPARATUS FOR CALGINING GRES.

Patented Feb. 7, 1865.

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.ilue or passage, for the passage of the products of combustion from the furnace tothe UNITED STATES PATENT OFFICE.

GEORGE WQIWHITE OE NEW YORK, N. Y.

' IM'PROVED APPARATUS FOR cALclNlNc `omas.

Specification forming part of Letters PatentNo. 46.287. dated February 7, 1865.

To all whom it may `concerni:

Be it knownv that I, GEORGE W.' WHITE, of the city, county andv State of New York, have invented a new and Improved Apparatus for lalcining Orcs and other Substances; and I dohereby declare that the following is afull, clear, and exact description of the same, reference being had to the accompanying draw; ings, which form part ofl this specificatiom'in which- Figure l isv a central longitudinal vertical section of the apparatus.` Fig. 2 is a transverse section at a, a. l

Similar letters of reference indicate corresponding parts in both figures.

Ihe principal parts of my apparatus consist of a furnace and an inclined rotating cylinderin which the ore or other substance to be calcined is subjectedV to the action'of heat'from the furnace. lfllhe principal pointsin which it .differs from otherl apparatus consisting of such a furnace and cylinder are, first', in having separate dues or passages for the gases of combustion generated in the furnace and for the ore or substance to be calcined, so that the said substance is not exposed to contact with the gases of combustion 5 second, in having the furnace located at the opposite end of the cylinder to that at Which'the ore enters, so that the `ore or other substance. to be calcined may be subjected to a gradually-increasing -temperature as the calcining progresses; third, in having the calciningilues or passages so combined with the furnace that the gases eliminated from the ore in the calcini'ng process may enter into combustion in the furnace, and thereby effect a saving of fuel. .There are also some minor points of difference which willl be here inafter explained. l w l A is a furnace 'of ordinary build, lined with fire-brick, and into which projects one end of the' cylinder B.- lThis cylinderV is supported` on rollers C O C, and kept inposition by guiderollers hh, Fig. 2. The several rollers are arn ranged to incline the cylinder downward to-v wardthe furnace. Rotary motion is conveyed lto the cylinder by means of achain working in the grooved pulley D upon its exterior. The inside of the cylinder B is formed of firebrick into several flues or passages-bnc, E, in the center, which I call the combustion smoke-stack e, and others,F F, arranged at equal distances apart around E, for calcining the ore. Each of the calcining-passages F F has grooves running longitudinally through their entirelength, as in the drawings, or provided with cavities n n or projections', for the purposes hereinafter specified.- These calcining-passages terminate at both ends on the circumference of theV cylinder, asfshown at m and rin Fig. 1. The upper'end of the cylinder projects into a chamber, G,- having a vertical division, k, through the center, making one compartment, b, which communicates with the flue E, for the exit of the products of combus'ton from the said flue to the 4smoke-stack e, and one compartment, c, throughthe upper partof Whichthe ore is-fed through the openings 'r into the calcining-passages F F as'the cylinder rotates. At the bottom of the com partment c is an opening, 13, by which the ore that may be split can be removed.

' H is a hopper'with a feed device, l, attached,

Worked by cams p, placedv at proper distances apart-on the outside of the cylinder B, for the purpose of feeding a specific quantity of ore into the calcining-passages at each rotation of the cylinder.l At the back end ofthe furnace A, and directly underthe-delivery ends m of the calcining-passages, is placed the trough d,

arranged at an inclination, andhavin g a stream of water iiow into it at the upper end, so as to wash down the ore as it is discharged. This trough projects through the side of the furnace behind the bridge-wallv I, and conveys vthe ore to any desired spot.

Near the top of the smoke-stack e is placed a coil of pipe, f, having a number of small holes pierced through the inside diameter, to which is connected the water-pipe g. The Water supplied through the pipe g has suflicienthcad to be forced through the coil horizontally in every direction, which prevents the escape of fine particles of ore and washes them 'down intothe compartment b,.where they are drawn off through the opening j.

The action'of this apparatus is as follows:

A re is built inthe furnace A, and the cylinder B is heated up by the frame and gaseous products of combustion passing through the central flue, E, to a suicient temperature, which is .many degrees higher at the furnace end than at the other end, where the ore is received. Thered arrows indicate the direction of the llame. The cylinder is rotated about twenty revolutions per minute. The ore in' Va pulverl ized or crushed condition is put into tliehop per H, and at each revolution of thecylinder the feed device l permits a small quantity of oretd enter each one of the different calciningpassages, the said device being opened, while th'openings vf are out of communication with the throat of the hopper, so that the gases a're not lpermitted to escape from the said passages to the atmosphere. rllhe calcining-passages being'grooved, or otherwise having their sur faces constructed in an equivalent manner and inclined, the ore is lifted up and dropped for- Ward a little at every revolution of the cylinder, thus gradually VWorking its Way toward the delivery end ofthe passages, as indicated by the black arrows. Thesulpliurous and other gases eliminated from it by heat pass ont of the delivery-openings m of the said passages as they, by the rotation of the cylinder, severally communicate with the upper part of the furnace, as indicated by the red arrows, and the said gases undergoing combustion in the furnace help to generate heat, thereby saving fuel. By feeding the ore into the calciningpassages in specific quantities at the Vcooler Aends of the passages F F farthest from the furnace, the ore is submitted at first to a comparatively low temperature, and graduallyintroduced to a higher one, ,while at the same time it is kept in constant motion in being lifted and showered through the heat which is free from the products of combustion,and each atom thereby has its surface exposed to the ace tion ofthe heat. The ore is thus entirelyl freed from sulphur while slagging, and other unfavorable effects are avoided. i

e What I 'claim as my invention, and desire to secure by Letters Patent, is`l 1. The combinationfin the rotating `cylinder, of separate.l combustion and ealcining ilues'or passages, substantially as and for the purpose herein specified.

2. The furnace located at the opposite end of the rotating cylinder to that at which the ore or other substance to be calcined enters, substantially as and for 'the purpose herein set forth. e

' 3. So combining the calcining ilues or passagesf the rotating cylinder with the furnace that the gases-eliminated from the ore or other' substance in the said passages may enter into combustion in the furnace, substantially as and for the purpose specified.

4. In a rotating cylinder with separate combustion and calcining ilues or passages, combined with a furnace, as described, constructing the inner surfaces of the separate calciningpassages with grooves, cavities, or projections,

substantially as and for the purpose herein specified.

5. The coiled perforated water-pipef, placed in the smoke-stack or vertical iiue, in combination with the rotating cylinder, substantially as and for the purpose herein specified.

= GEO. W. WHITE.

Witnesses:

HENRY T. BROWN, J. W. CooMBs. 

